1 /* 2 * Copyright (c) 2017-2018, STMicroelectronics - All Rights Reserved 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <asm/byteorder.h> 8 #include <errno.h> 9 #include <fcntl.h> 10 #include <stdint.h> 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <string.h> 14 #include <sys/mman.h> 15 #include <sys/stat.h> 16 #include <sys/types.h> 17 #include <unistd.h> 18 19 /* Magic = 'S' 'T' 'M' 0x32 */ 20 #define HEADER_MAGIC __be32_to_cpu(0x53544D32) 21 #define VER_MAJOR 2 22 #define VER_MINOR 1 23 #define VER_VARIANT 0 24 #define HEADER_VERSION_V1 0x1 25 #define TF_BINARY_TYPE 0x10 26 27 /* Default option : bit0 => no signature */ 28 #define HEADER_DEFAULT_OPTION (__cpu_to_le32(0x00000001)) 29 30 struct stm32_header { 31 uint32_t magic_number; 32 uint8_t image_signature[64]; 33 uint32_t image_checksum; 34 uint8_t header_version[4]; 35 uint32_t image_length; 36 uint32_t image_entry_point; 37 uint32_t reserved1; 38 uint32_t load_address; 39 uint32_t reserved2; 40 uint32_t version_number; 41 uint32_t option_flags; 42 uint32_t ecdsa_algorithm; 43 uint8_t ecdsa_public_key[64]; 44 uint8_t padding[83]; 45 uint8_t binary_type; 46 }; 47 48 static struct stm32_header stm32image_header; 49 50 static void stm32image_default_header(struct stm32_header *ptr) 51 { 52 if (!ptr) { 53 return; 54 } 55 56 ptr->magic_number = HEADER_MAGIC; 57 ptr->header_version[VER_MAJOR] = HEADER_VERSION_V1; 58 ptr->option_flags = HEADER_DEFAULT_OPTION; 59 ptr->ecdsa_algorithm = 1; 60 ptr->version_number = 0; 61 ptr->binary_type = TF_BINARY_TYPE; 62 } 63 64 static uint32_t stm32image_checksum(void *start, uint32_t len) 65 { 66 uint32_t csum = 0; 67 uint32_t hdr_len = sizeof(struct stm32_header); 68 uint8_t *p; 69 70 if (len < hdr_len) { 71 return 0; 72 } 73 74 p = (unsigned char *)start + hdr_len; 75 len -= hdr_len; 76 77 while (len > 0) { 78 csum += *p; 79 p++; 80 len--; 81 } 82 83 return csum; 84 } 85 86 static void stm32image_print_header(const void *ptr) 87 { 88 struct stm32_header *stm32hdr = (struct stm32_header *)ptr; 89 90 printf("Image Type : ST Microelectronics STM32 V%d.%d\n", 91 stm32hdr->header_version[VER_MAJOR], 92 stm32hdr->header_version[VER_MINOR]); 93 printf("Image Size : %lu bytes\n", 94 (unsigned long)__le32_to_cpu(stm32hdr->image_length)); 95 printf("Image Load : 0x%08x\n", 96 __le32_to_cpu(stm32hdr->load_address)); 97 printf("Entry Point : 0x%08x\n", 98 __le32_to_cpu(stm32hdr->image_entry_point)); 99 printf("Checksum : 0x%08x\n", 100 __le32_to_cpu(stm32hdr->image_checksum)); 101 printf("Option : 0x%08x\n", 102 __le32_to_cpu(stm32hdr->option_flags)); 103 printf("Version : 0x%08x\n", 104 __le32_to_cpu(stm32hdr->version_number)); 105 } 106 107 static void stm32image_set_header(void *ptr, struct stat *sbuf, int ifd, 108 uint32_t loadaddr, uint32_t ep, uint32_t ver) 109 { 110 struct stm32_header *stm32hdr = (struct stm32_header *)ptr; 111 112 stm32image_default_header(stm32hdr); 113 114 stm32hdr->load_address = __cpu_to_le32(loadaddr); 115 stm32hdr->image_entry_point = __cpu_to_le32(ep); 116 stm32hdr->image_length = __cpu_to_le32((uint32_t)sbuf->st_size - 117 sizeof(struct stm32_header)); 118 stm32hdr->image_checksum = stm32image_checksum(ptr, sbuf->st_size); 119 stm32hdr->version_number = __cpu_to_le32(ver); 120 } 121 122 static int stm32image_create_header_file(char *srcname, char *destname, 123 uint32_t loadaddr, uint32_t entry, 124 uint32_t version) 125 { 126 int src_fd, dest_fd; 127 struct stat sbuf; 128 unsigned char *ptr; 129 130 dest_fd = open(destname, O_RDWR | O_CREAT | O_TRUNC | O_APPEND, 0666); 131 if (dest_fd == -1) { 132 fprintf(stderr, "Can't open %s: %s\n", destname, 133 strerror(errno)); 134 return -1; 135 } 136 137 src_fd = open(srcname, O_RDONLY); 138 if (src_fd == -1) { 139 fprintf(stderr, "Can't open %s: %s\n", srcname, 140 strerror(errno)); 141 return -1; 142 } 143 144 if (fstat(src_fd, &sbuf) < 0) { 145 return -1; 146 } 147 148 ptr = mmap(NULL, sbuf.st_size, PROT_READ, MAP_SHARED, src_fd, 0); 149 if (ptr == MAP_FAILED) { 150 fprintf(stderr, "Can't read %s\n", srcname); 151 return -1; 152 } 153 154 memset(&stm32image_header, 0, sizeof(struct stm32_header)); 155 156 if (write(dest_fd, &stm32image_header, sizeof(struct stm32_header)) != 157 sizeof(struct stm32_header)) { 158 fprintf(stderr, "Write error %s: %s\n", destname, 159 strerror(errno)); 160 return -1; 161 } 162 163 if (write(dest_fd, ptr, sbuf.st_size) != sbuf.st_size) { 164 fprintf(stderr, "Write error on %s: %s\n", destname, 165 strerror(errno)); 166 return -1; 167 } 168 169 munmap((void *)ptr, sbuf.st_size); 170 close(src_fd); 171 172 if (fstat(dest_fd, &sbuf) < 0) { 173 return -1; 174 } 175 176 ptr = mmap(0, sbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, 177 dest_fd, 0); 178 179 if (ptr == MAP_FAILED) { 180 fprintf(stderr, "Can't read %s\n", srcname); 181 return -1; 182 } 183 184 stm32image_set_header(ptr, &sbuf, dest_fd, loadaddr, entry, version); 185 186 stm32image_print_header(ptr); 187 188 munmap((void *)ptr, sbuf.st_size); 189 close(dest_fd); 190 return 0; 191 } 192 193 int main(int argc, char *argv[]) 194 { 195 int opt, loadaddr = -1, entry = -1, err = 0, version = 0; 196 char *dest = NULL, *src = NULL; 197 198 while ((opt = getopt(argc, argv, ":s:d:l:e:v:")) != -1) { 199 switch (opt) { 200 case 's': 201 src = optarg; 202 break; 203 case 'd': 204 dest = optarg; 205 break; 206 case 'l': 207 loadaddr = strtol(optarg, NULL, 16); 208 break; 209 case 'e': 210 entry = strtol(optarg, NULL, 16); 211 break; 212 case 'v': 213 version = strtol(optarg, NULL, 10); 214 break; 215 default: 216 fprintf(stderr, 217 "Usage : %s [-s srcfile] [-d destfile] [-l loadaddr] [-e entry_point]\n", 218 argv[0]); 219 return -1; 220 } 221 } 222 223 if (!src) { 224 fprintf(stderr, "Missing -s option\n"); 225 return -1; 226 } 227 228 if (!dest) { 229 fprintf(stderr, "Missing -d option\n"); 230 return -1; 231 } 232 233 if (loadaddr == -1) { 234 fprintf(stderr, "Missing -l option\n"); 235 return -1; 236 } 237 238 if (entry == -1) { 239 fprintf(stderr, "Missing -e option\n"); 240 return -1; 241 } 242 243 err = stm32image_create_header_file(src, dest, loadaddr, 244 entry, version); 245 246 return err; 247 } 248